Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Hello there Marvin,

--- In Homebrew_PCBs@yahoogroups.com, mpdickens <md30022@y...> wrote:
> More than likely, there is a film on the board and the
> resist is not bonding to the board. Probably, it's
> whatever your using to clean it with. I use comet or
> ajax to clean scrub the board (This ensures fresh
> exposed copper...). Then I wash with water to remove
> any cleaner. I then wipe it down alcohol to make sure
> no residues are on the board. At this point, I use a
> new (And therefore, clean) paper towel. At this point,
> I apply the resist.

I am scrubbing with ajax right now with bleach and a new scotch
bright. This was my first thought too, but I think the boards are
getting clean enough at this point. However, the gloves are a good
idea and also the alchohol wipe down. They do mention to use amonia
in the directions at there web site and I have not tried this yet.
>
> YMMV, but it works for me every time.

Do you just spray on one coat of the resist? I am wondering about the
depth of the coat.
How do you expose, for how long?
What are you using for a negative!

Thanks for the response, I feel as though I am very close, however
not quite there. Whats the board look like when your done, still
pretty much clear but just barely see the traces when tipped to the
side in the light?

_ED